Features: Professional power supply for guitar effect pedals, full metal shell, durable and sturdy. 12 isolated and truly independent 9V DC outputs: 2 * 500mA, 4 * 300mA(one with selectable voltage 9V/12V/15V/18V), 6 * 200mA. A total of 3400mA output. Dual toroidal transformers and enhanced filtering provide clean and quiet power. Each output has separate short-circuit and over-current protection, safe and reliable to use; designed with LED indicator lights for helping you check the working status of each output. Convenient switch to change the input A/C voltage(220V-240V/110V-120V) for use in different countries. Please ensure you have set the power selection switch to the right AC voltage you need.